A tail wheel assembly that mounts to the rudder will not last long. You should get an assembly that bolts or screws to the bottom of the fuse with a "tiller" arm. Then you can run either pull cables or just a separate light weight push rod hooked directly to the rudder servo.

There are several good assemblies available from Tatone, Sullivan, etc. Go to Tower and enter "tail wheel assemblies" in the search box for a good selection. Everyone has different and unique ways of setting it up, just do it the way that works best for you.
Bob